/*
 * truth.c - 哪些值为真
 */
#include <stdio.h>
int main(void)
{
    int n = 3;
    while (n) {
        printf("%2d is true\n", n--);
    }
    n = -3;
    while (n) {
        printf("%2d is false\n", n++);
    }
    printf("%2d is false\n", n);
    return 0;
}
